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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e154a5c7892f4029c007b2c71df97fde06f8ac3391ea4720d035d14028d902' 
  AND token = 'x+amknW8pr+Iw/2JMP5+fQEjb9rOTeI+2SC8cUxGHcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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