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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1fc9baa6ebc79acc361a322ced8521f30d5975a25b9cb13c4132b860f21f69' 
  AND token = 'v+5JpGxem+/FjZECFiDIcEewkYMxupB4s9bsAeJ3tuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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