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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37169b0b9cdcddad423b984be2c1e2b05203ca6cd88f0a7940d1d644f5dce732' 
  AND token = '+5TjW+8JvwJcCXx51KCyJlJcnp6hIvYl3HvQDvSCLIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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