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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a472bda9451ce6480b611b61e62bf48c57d99aa4d5db6b2c38ffa39ce5dda140' 
  AND token = '6o0M/njXAhmlcj8knhbevvkolriRn82WCj5yj3r1J9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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