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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1167c66bd2a46f1a4e46520e1d2e79938321ce11180a63ac26d3bc0b4e00335f' 
  AND token = 'Mtip5Qipq5vUbF4sQDBr7/atCJrg/rugGerp8qDC75o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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