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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474a87b0b6853ff6da9565b08b59323b8c500fb1d4fc69dfdb72e2fe9a2f6cd3' 
  AND token = 'HyXOpBC8OUPHC6R5+7qe+okm5vA04daz8cexkRci3Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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