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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de2ac667bdd4b4efa5ca86765080fa090e1814ffb37e7059266102b68bec3bd' 
  AND token = 'C/c327Hb0HCr4Kzn4YNUMs9jcOIJNyPw6ejc6Nzej8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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