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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aadd3316c944e947f97d70f494e4b8f9b7468b2082714e1a54ef48627e7a33f9' 
  AND token = 'WvQQJgpeG6kJm7cJV2R/YB7bfW7weHY/S91SwDtooew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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