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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d805cdb4399c74ac06f59481436002e55dc28dd9a4b077a35ef0fb30993faa' 
  AND token = '2MCppRaNuFUkzx//rqPJnG2151XJM6Gn0Y+5uiUQ4sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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