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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316d7f3c74a7d4ba53b38ca4b7eea0283d13964731b4c6afdaf90687d1040dc8' 
  AND token = '5txLKCoiWf34M8li+voNuncauxk077RCALlU9JQxqXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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