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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb82fe8e3b5af2c305dfbdb918c504bc595a438f4e47d44faf982df9739a2cf' 
  AND token = 'z8YrbM7T+cSNYGM3Ool5t8KvIWnFoGUwxR5DspFy94M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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