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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccbd4f60b240118ccc6fd1424aa2f3713acb432f4c657723cb468afd7a3ddce3' 
  AND token = '26zlL4XGR37tEYrWVfWCmy0+BhtBbFWYjPlfaIOENTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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