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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f5bf47e9b1bb8df084eb139e485b02eb95cce75d2a8b71750c76b26bbab4e4' 
  AND token = 'z75C58M5PVKWE1Kn660H75xS4oAekwbSHiazMVGVqHA=' 
  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"
    }
  }
}