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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0d852dcaa632b38bd38096a198c4a96836ca5465830d474124cb17a9c07483' 
  AND token = 'wtzM6hgyA/eDa787maYR06KGkVoHIl4DFnZdLsz+mQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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