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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276164d00f807a3afb915b67bab58e3427ab4468819173a6ea3bb907200d3640' 
  AND token = 'GEEjwa4nwZ1O6J/eqx9/AceQP2hfrOM27skCsX7kJA8=' 
  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"
    }
  }
}