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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5d622b1457af0ca318c3d274ea3912a24cab2093683b2f53dc18247cf07584' 
  AND token = '7DHHR6b3juSGjEac4fg99i0rGz5TzAGb97mUtf+O0xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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