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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5b30e4f12cfeaae3b46ae29795d331b5e64b47eb0e8ea8597d5de67bb2923a' 
  AND token = 'mhXy6549hiEU2ZM5+YmHLbT7HvkDKWVUzM0TSCMOok0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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