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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ed43ff5db18765ad83ca88df9081c5af282935dbbab560eb3e720b18fad808' 
  AND token = '3hc5hG2WeTLHdN85IAqSoofl4j0F8wAud4JxPDBGeHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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