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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a926b0060b028d365b74042708542cab8ca71aa0545d04ad8e8cce8dc14a7cc' 
  AND token = 'DqNOYbujPbDBbiVj4uIxeNP2xa7hgmRK824+nYCwovI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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