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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1778cc22defd50568bdbef9f70fa3a182b0a6e56b39fbbf026b72962d694394d' 
  AND token = 'b6xr1IfO2p/+Iw4K4Qe3EgyQ/l4MPr/xwUZr3O+pX08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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