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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abbfef4768e4145e7dec7a5328fd3f31c4c5e1bdb18d2c28140aa73a688611e' 
  AND token = '7EIfJSsEjmH3YS7E8z6albcOjH+EwT9VxB3ReAJ/Vss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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