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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945560c223ac96ebf1252001913d7dc3b0bad42a51f34af1cb2a15ad51421af2' 
  AND token = 'l92dMofyYPLV5Tfxu4lkW+LB2/jxvmYol9uXdflaGxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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