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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142a74cb6f9cc3815917906dd19f583a1d80b853b00a6cf1cda6e12516979037' 
  AND token = '5O7f1OMEGwl9mEHShK57enx8mrrda5gvJIBkK0nonhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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