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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a4c7b2827bf2c7e51d17fe58212e528fab86c681a3317dc0799ea3951b1f88' 
  AND token = 'V/t2f40STUD7LKbynpgNTQ36u/GOpSVo0hoVw+QRJvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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