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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea68e4ec919fae1f93942073e8b0894ab135bb29b3fa9d4d335c14b5a9bd6bc' 
  AND token = 'FQ3Kou3Su/SnIzyUbWylY5Pue3nPz6I+ZCUvI8xGFr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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