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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387a23a0bf58152bd7af01cf48646add784ad050525ba317cd2cdeef2c692d61' 
  AND token = 'GimI+84ns+cJpnz240S8wraCCsEy0Y9sOGNdCwUmNGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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