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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bde84633b01b69558bcf533c8d73e96a6df8ad5e63636a592b2fccbf40d9abc0' 
  AND token = 'f0nCRDvMSqKc5NLG9+hqBEsATJWwHbLIgorrQr87yBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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