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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10e6cca44628d383237235de57a566d0ccc8018ac8b218629d88a654c594ba1' 
  AND token = 'Ufe+znsp794j/1vGTS2EWGpy5KEl7sGzS5ZTz4YhdrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}