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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab1cef5d46893444e0c5747419f013f0b117d85a9ebef96e8a501e34c876fed' 
  AND token = 'MxzDNFBLFJ+TjgBYuwX3N6S16OEMa+BAJrQPnrR083Q=' 
  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"
    }
  }
}