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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8096f0534cb96b7968dc9d4c39a1a92201a92511da27fbbaed9d47fcf4c809' 
  AND token = 'O7tKwN47Nnv8fnanGOz9/UOxynAYdYLXKiVYmFVvba4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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