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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eaa90a2da083e2491a47de5623bc65b2fb76665d78b4ff82a81416e535ba4a5' 
  AND token = '9ucj0Efr8Tmep1Zm5NGNH3CAqQs4Tca7o+OR5QgoE6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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