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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfa375beef7431b2a6f48125a4f7f84a4eb659ea094c1df7915b0862a877472' 
  AND token = 'aPOqbwwYQm2DFqLK7jiqCi8gkaRqf7oDgoWZIkvnZgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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