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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f116e645d9cefea12e7e3b73016c8faaca08b7fd45e4ea863fbe4e1a14ee0069' 
  AND token = 'T2EGJ/viEWiN+lE9VNJoFDmXOWDwl50HiZ8CFBAotsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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